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(No Model) W. S. BOSLEY. CARBON BRUSH HOLDER FOR DYNAMOS.

Patented May 14, 1895.

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UNITED STATES PATENT OFFICE.

\VINEIELD S. BOSLEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE TVESTERNELECTRIC COMPANY, OF SAME PLACE.

CARBON-BRUSH HOLDER FOR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 539,082, dated May 14,1895.

Application filed September 8, 1894. Serial No. 522,442. (No m d l.)

To all whom it may concern.-

Be it known that I, WINFIELD S. BOSLEY, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Carbon-Brush Holdersfor Dynamos, (Case No. 1,) of which the following is a full, clear,concise, and exact description, reference being had to the accompany- [0ing drawings, forming a part of this specification.

My invention relates to carbon brush holders for dynamos, and its objectis the provision of a brush holder that shall be cheap of ISconstruction; that will permit the ready replacement of the carbon whenworn, and that will clamp the carbon in such a manner as to permit thealmost complete wearing away of the carbon before a removal of the sameis necessitated.

My invention comprises a bar forming the body portion of the brush andadapted to be clamped in the brush holder. The end of the bar is bent orcurved so that the end of the bar bears upon the carbon holder, andbetween the bent portion and the end of a clamping plate the carbonblock is adapted to be held. The clamping plate is secured by one end tothe under side of the bar and rests by 0 its opposite end against thecarbon block, a screw being passed through the bar and the plate, bymeans of which the bar may be moved toward the plate to clamp the blockin position.

5 My invention will be readily understood by reference to theaccompanying drawings, in which Figure 1 illustrates the brush of myinvention applied toa commutator. Fig. 2 is a par- 0 tial plan view ofthe brush. Fig. 3 is a partial view of the under side of the brush.

Like letters refer to like parts in the several figures.

The bar a, forming the body of the brush,

.5 is adapted to be held in a brush holder 1) which may be of anysuitable form, the end of the bar being bent to form a projection aagainst which the carbon block 0 may be pressed to hold the same inposition.

The clamping plate (1 is secured to the under side of the bar a by meansof rivets cl 6. the end of the clamping plate which engages with thecarbon block being bent so that it may engage the block at about thesame distance from the bar as does the end of the projection a.

A screw 5 is adapted to pass through the bar a and the clamping plate d,a washer c being provided beneath the head of the screw, while a plate 8is secured to the clamping plate (Z and provided with a tapped holeadapted to be engaged by the threads upon the screw 6.

By unscrewing the screw 6 the clamping plate may be moved away from thebar Ct to permit the insertion of the carbon block 0 between said plateand the projection a, after which the screw 6 may be turned to draw theclamping plate 61 toward bar a and clamp the carbon block between theend of said plate and projection a. The end of clamping plate 7c dengaging the block at about the same distance from the bar a as does theend of the projection a, the carbon block is serviceable until it hasbeen worn down almost to the points of contact. 5

A brush is thus provided which is simple and economical inconstructiomis made of few parts, and these so arranged that there isnothing to get out of order.

- Having described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination with the bar upturned at its end, of a clamping platesecured by one end to said bar, a carbon block adapted to rest 8 5between said upturned end and the elevated end of said clamping plate,and a screw for moving the end of said clamping plate toward or fromsaid bar to clamp or release the carbon block, substantially asdescribed. 0

2. The combination with the bar a upturned at the end to form aprojection to, of the clamping plate d secured by one end to said barand adapted to rest by the opposite end against the carbon block, saidcarbon block, 5 the screw 6 passing through the bar a and adapted toengage a tapped hole carried upon the clamping plate d, substantially asdescribed.

3. The combination with the bar a, the end thereof being upturned toform a projection carried upon the clamping plate 02, substana', of theclamping plate at secured by one end tially as described. to to said barand adapted to rest by the oppo- In witness whereof I hereunto subscribemy site end against the carbon block at a dis name this 22d day ofAugust, A. D. 1894.

5 tan'ce from said bar a substantially equal to WINFIELD S. BOSLEY.

the length of said upturned end, said carbon Witnesses: I block, and thescrew 6 passing through the 7 CHARLES A. BROWN,

bar a and adapted to engage a tapped hole HARRIET G. TEMPLETON.

